Absorption refrigerator and production method thereof

An absorption refrigerator comprising a high temperature regenerator for heating a water solution including a halogen compound to generate steam, a condenser for condensing the steam, a low temperature regenerator for cooling the steam, an evaporator for evaporating the water from said condenser and producing cold water, an absorber for absorbing the water from said evaporator into a water solution including a high concentration halogen compound, and a heat exchanger for returning the refrigerant issued from said absorber to said high temperature regenerator and effecting heat exchange between the water from said low temperature regenerator and the refrigerant from said absorber,

• wherein an oxide film having thickness of 0.02-5.0 .mu.m, one of the colors blue, purple and gray, or a hydroxyl group is formed on at least a portion, contacting said water solution, and made of iron or iron-containing material, of each of said high temperature regenerator, condenser, low temperature regenerator, evaporator absorber and heat exchanger, and
• wherein said heat exchanger comprises a heat conductor group having a plurality of stacked heat conductors, each heating conductor being formed of two thin corrugated plates piled up on each other and welded at their peripheries, a container for accommodating therein said heat conductor group, inlets and outlets provided in said heat conductors to join liquid flowing inside said heat conductors, and an inlet and outlet for liquid flowing outside said heat conductors.